I think I've started this post before but I just thought I'd p*** this along. since a lot of circle track guys have to use stock castings. Heads, Manifolds, etc. Performance Stock Intake Casting Numbers for SBC Aluminum Intake Manifolds Part Number Carb Type Year Engine HP 3917610 4BBL Holley 1967-68 302 290 (Z/28) 3932472 4 BBL Holley 1969 302 290 (Z/28) 3941126 2X4BBL Holley 1968-69 302 290 (Z/28 crossram bottom half) 3941130 2X4BBL Holley 1968-69 302 290 (Z/28 crossram top half) Cast Iron Intake Manifolds 3877652 2BBL (all) 1967 327 210 283 195 3905393 4BBL Rochester 1967 327 275 350 295 3916313 2BBL Rochester 1969 350 250 3919801 2BBL Rochester 1968 327 210 3919803 4BBL Rochester 1968 327 285, 325 350 295 3927183 2BBL Rochester 1969 307 200 327 210 3927184 4BBL Rochester 1969 350 255, 300 These are the "Good " manifold casting numbers the Chevy circle track guys are looking for so next time your tearing down that sbc core engine for your new project car to put on one of them fancy muliti carb aluminum intakes check the casting number. One of the casting numbers missing on this list is a 4bbl manifold ending in "055" I've seen some of these manifolds listed for good money on ebay. I don't know if they actually get it but it's better then s**** price anyway. And at least they're not being sent to china. IF you should find any 2bbl Canadian "313" or "467" intakes those are better yet. Again just thought I'd past this along since I just KNOW a lot of these casting have been thrown in the s**** pile when they could be used by fellow car guys.
That's good info. As intakes go, I don't see any Bowtie guy (or any car guy) worth his salt **** canning an aluminum snowflake (Winters Foundry) intake, let alone a cross-ram. The iron one like Larry mentioned was a hot item at one time for the roundys (iron intake cl***). Still, all good info, thanks for posting.
Brezinski said "All of the 150, or so, stock intakes that we tested flowed between 160 & 165 cfm per runner, when the flow numbers for all 8 ports were averaged. With such a small variation in stock flow numbers we have concluded that “there is not much difference from one stock intake to another.”
Also left out two of the most well respected factory smc alum. intakes: Casting # 3844461-- 64-65 Corvette (365 hp) & 65 Chevelle (350 hp). Casting # 3890490--66-67 Corvette, 66 Nova, 65 (350 hp)& 67 (325 hp) Chevelle. Many of these were replaced with better intakes (for racing) and sat on shelves for years, then e-bay happened. You can still get lucky once in a while at garage sales though.
`...Also left out two of the most well respected factory smc alum. intakes: Casting # 3844461-- 64-65 Corvette (365 hp) & 65 Chevelle (350 hp). Casting # 3890490--66-67 Corvette, 66 Nova, 65 (350 hp)& 67 (325 hp) Chevelle. Many of these were replaced with better intakes... But were they better? Every rod mag Edelbrock dyno test of SBCs I ever saw with a 350HP or similar engine always started with cast iron low perf 4bbl intake for step 1, then went to an Eddy alum 4bbl hi rise for step 2. I have never seen a comparison of the factory aluminum VS aftermarket 4bbl intake. I wonder why?
Another one also left off the list is the 4BBL manifold with a casting number that ends in "771". Also if you find a 055 manifold with a "crows foot that is also desirable.
I found my other thread. http://www.jalopyjournal.com/forum/threads/chevy-intake-manifolds.743646/#post-8256883
Having run circle track for years and running in the cast iron intake cl***es. the pre egr q jet intakes were about as good as it gets unless they let you run the cast iron copy of the Z 28 intake that was for marine applications. Most tracks would not let you run a holley based intake. To make it fair they let you run a Qjet on a Qjet intake or an 1850 Holley with an adapter. the 1850's work better on circle tracks if you turn them around backwards on the intake. Don't run out of gas in the turns. I always liked the Qjet better.
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